1. Department of Gastroenterology, Juntendo University School of Medicine, Tokyo 113‑8421, Japan
2. Department of Gastroenterology, Juntendo Tokyo Koto Geriatric Medical Center, Tokyo 136‑0075, Japan
3. Laboratory of Morphology and Image Analysis, Biomedical Research Core Facilities, Juntendo University School of Medicine, Tokyo 113‑8421, Japan
4. Department of Medical Technology Innovation Center, Juntendo University School of Medicine, Tokyo 113‑8421, Japan